The Democratic Party (Portuguese: Partido Democrático, pronounced [pɐɾˈtiðu ðɨmuˈkɾatiku]), officially known as the Portuguese Republican Party (Portuguese: Partido Republicano Português [pɐɾˈtiðu ʁɛpuβliˈkɐnu puɾtuˈɣeʃ]), was a Portuguese centre-left political party during the Portuguese First Republic. It was also the self-proclaimed successor to the original Portuguese Republican Party, which had been behind the revolution that established the Portuguese First Republic in 1910.
The name "Democratic Party" was never the official name of the party, as the Portuguese Republican Party never ceased to exist. However, the party was de facto different and thus the other parties (that belonged to the PRP before 1910) used the new expression to assert their opposition to the claim of continuation of the PRP by Afonso Costa, the first leader of the Democratic Party. Other names were given to the members of the Democratic Party, like the Afonsists, named after Afonso Costa.